Loop-taker for sewing machines



Sept. 24, 1935. H. J. vGoosMAN LOOP TAKER FOR SEWING MACHINES I 2 sheets-sheet 1 Filed Oct. l0, 1933 Ila:

IIIHIII.

Herber el Goosm an sept 24, 1935. \H. J. GoosMAN LOOP TAKER FOR SEWING MACHINES Filed` Oct. .1 0, 1935 2 Sheets-Sheet 2 Patented Sept. 24, 1935 PATENT OFFICE LOOP-TAKER FOR SEWING MACHINES Herbert J. Goosman, Elizabeth, N. J., assignor to The Singer Manufacturing Company, Elizabeth, N. J.,- a corporation of New Jersey Application October 10, 1933, Serial No. 692,934

22 Claims.

Thisinvention relates to improvements in looptakers for sewing machines and more particularly fto lock stitch loop-takers.

The invention will be understood by reference to the accompanying drawings in which:

Figure 1 is a face View of a loop-taker embodying my invention. Figures 2, 3 and 4, are left, right and bottom side views of the loop-taker as viewed in Figure 1,

Figure 5 is a back view. Figure 6 is a face View with the thread-case removed, showing the normal position of the gib in full lines and its position, in dotted lines, when an obstruction is encountered in the raceway.

Figure 7 is a sectional view taken along the line I-'I of Figure 1-.

Figure 8 is a view similar to Figure 7 showing the position of the parts of the loop-taker if thread Should be caught in the raceway.

Figure 9 is a disassembled perspective View of the component parts of the loop-taker.

Figure 10 is a perspective view of the back of the loop-taker body and the gib.

Figure l1 is a section taken along the line I I-I I of Figure 5.

Figure 12 is a section taken along the line I-IZ of Figure 1.

Figure 13 is a section taken along the line Iii-I3 of Figure 1.

In the embodiment of this invention selected for illustration, the loop-taker comprises a base or body I which is formed with a flange 2 terminating at one end in a loop-seizing beak 3 and its op-V posite end in a vertical wall 4 having an overhanging portion 5. Pivotally secured to the base I by the pivot-screw 6, which is located beneath the overhanging portion 5 and diametrically opposite the gap in the hook-body adjacent the loopseizing beak, is a gib 'I formed with a Wall l', an overhanging ledge B and a depending flange 8. A spring 9 located in a pocket or recess I5 on the Vback of the hook-body I has an extension I I which is seated in a groove I2 in the gib 'I. The spring 9 reacting between the hook-body I and the gib 'I tends to constantly urge the gib in a counterclockwise direction about the pivot-pin 5. In its normal position the ange 8 on the gib 'I engages the edge I3 of the hook-body, (Figure '7), the edge I3 serving to limit the movement of gib l in a co-unterclockwise direction about thepivotpin Ii.

The gib 'I is provided with a slot I4 which is formed on the arc of a circle the center of curvature being the pivot-pin 6. A shouldered screw I5 extends through the slot and is threaded into the base I of the hook. The slot I4 and the screw I5 serve to hold the free end of the gib against the hook-body and also to limit its expanding movement. It is to be understood, however, that the screw I5 and slot I5 are not essential and that 5 they may be omitted without materially efecting the operation of my improved loop-taker. In this connection it will be evident that the spring 9 also acts to hold the gib l against the base I, the end of the spring 9 reacting against the flat loop- 10 guard plate I5 fixed to the bottom of the looptaker by the screw IIS'.

The plate E6 is formed with a struck-up portion Il which engages the sharp edge 2 of the ange 2. This construction avoids forming a recess or 15 opening between the plate I5 and the body of the hook in which thread may be caught during the operation of the machine. A bobbin-case I8 is formed with an annular bearing rib I9 which is received in the raceway 25 formed in the ange 20 2 and the raceway 2l formed between the over-y hanging ange 'I' o-n the gib l and the base of the loop-taker (Figures 7 and 8) It will be understood that the raceways and ZI are in the same plane and, in effect, a single raceway. The bobbin-case I8 is provided with the usual rotationrestraining linger 22 and a centrally located post 23 on which is mounted the usual bobbin-case cap 24. v

When a loop-taker having a thread-case journaled in a raceway, as heretofore constructed, is used to cooperate with a needle to form stitches, thread or some foreign material is occasionally caught in the raceway with the result that the loop-taker is jammed and consequently the entire machine rendered inoperative. One of the main causes of this difliculty is attempting to operate the machine without work under the presser-foot and with the presser-foot raised, the needle being threaded. When the machine is so operated the needle-thread is seized by the loopseizing beak of the loop-taker and drawn below the throat-plate. The needle-thread is out of control under these conditions and the needleloop is not drawn down the beak of the looptaker far enough for the needle-thread to be seized or retained on the hook I8 formed on the bearing-rib of the thread-case. Upon continued rotation of the loop-taker body and loopseizing beak the thread is drawn down until it 50 contacts with the bearing rib on the threadcase and when this occurs the thread is wedged into the raceway, and the loop-taker becomes jammed.

In Figure 8 of the drawings I have shown a 55 piece of thread 25 caught in the raceway of my improved loop-taker at a point near the loopseizing beak. As shown, the thread causes the entire thread-case to be shifted in a plane at right angles to the axis of rotation of the looptaker, the yieldable gib 'i' moving from the position shown in Figure 7 to the position shown in Figure 8. It will be obvious from the foregoing that the raceway in which the bearing rib of the thread-case is journaled is expansible in a plane at right angles to the axis of movement of the loop-taker during the operation of the machine.

Although I have shown my improvement applied to a loop-taker of the type shown in the patentI to Finch, No. 1,048,672, dated December 31, 1912, it will be apparent that it may be applied to any stitch-forming mechanism which is complemental to the needle and having a stationary member and a movable member with interlocking means therebetween, the needlethread passing between the two members, such, for instance, as oscillating and rotary shuttle machines. It will also be apparent that either or both of the flanges forming the raceway may be made yieldable and it will be understood that the form, construction and arrangement of the several elements employed may ve varied. Therefore, the privilege is reserved of resorting to all such legitimate changes therein as may be fairly embodied within the spirit and scope of the appended claims.

Having thus set forth the nature of the invention, what I claim herein is:-

1. A circularly movable loop-taking means for sewing machines including a cup-shaped body provided with an annular raceway radially yieldable to undue obstructions during thc operation of the sewing machine, and a thread-carrying element journaled in said raceway.

2. In circularly movable loop-taking mechanism for sewing machines, a member formed with an annular wall, a thread-carrying element journaled therein, said wall being constructed to yield radially to undue obstructions during the operation of the sewing machine.

3. A loop-taker for sewing machines comprising a circular loop-seizing member movable about an axis and provided with an annular raceway which is expansible in a plane at right angles to the axis of said member during stitch-forming cycles.

4. A non-jamming loop-taker for sewing machines comprising a loop-seizing member movable about an axis and formed with a raceway, a thread-case having an annular bearing flange journaled in said raceway, said bearing-flange being positively confined in said member against displacement in the direction of the axis of said member and yieldingly confined in a plane at right angles to said axis during the operation of the machine.

5. A non-jamming loop-taker for sewing machines comprising a loop-seizing member movable about an axis and formed with a yieldable raceway, a thread-case having an annular bearing-flange journaled in said raceway, said thread-case being bodily movable in a plane transverse to the axis of said member when the flange on the thread-case encounters an obstruction in the raceway during the operation of the machine.

6. A loop-taker for sewing machines comprising a loop-seizing member movable about an axis and provided with flanges forming a raceway, one of said flanges being xed to said member and the other iiange being yieldably secured to said member for movement in a plane at right angles to the axis of said member during the operation of the machine, and a thread-case having an annular bearing-ange journaled in said raceway.

7. A rotary loop-taker for sewing machines comprising a loop-seizing member movable about an axis and provided with flanges forming a raceway, one of said anges being iixed to said member and the other ange being pivoted to said member and yeildingly urged towards said rst ange, the flanges being so constructed yand arranged as to permit the racewayto expand radially during the operation of the machine.

8. A circularly moving hook for sewing machines formed with a loop-seizing beak and a circular raceway having a gap therein adjacent the point of said beak, a thread-case having a bearing rib journaled in said raceway, the raceway forming portion of the hook including a radially yieldable section pivotally connected to the hookbody at a point substantially diametrically opposite said gap.

9. In stitch-forming mechanism for sewing machines, a bobbin-carrier having a bearing rib element, a supporting element having a raceway therefor, one of said elements being formed with a pivotally yielding section movable in the plane .l

of said raceway.

10. A circularly movable loop-taker for sewing machines comprising a loop-taker body having a loop-seizing beak in xed relation therewith, a raceway formed in said loop-taker body, said raceway being expansible in a plane at right angles to the axis of said loop-taker body during the operation of the machine, and a thread-case having a bearing rib journaled in said raceway.

11. A circularly movable loop-taker for sewing machines comprising a loop-taker body formed with a flange having a loop-seizing beak at one end thereof, said flange being provided with a raceway, a gib pivotally secured to said looptaker body, said gib together with the loop-taker body forming a raceway which is in the same plane as the raceway in said flange, means for constantly urging said gib about said pivot into contact with said loop-taker body, and a threadcase having a bearing-Hange journaled in said raceway.

12. A loop-taker for sewing machines comprising a loop-taker body formed with a flange having a raceway, a gib provided with a wall and an overhanging ledge pivotally secured to said hook-body, said gib together with the hook-body forming a continuation of the raceway in said iiange, and spring means for constantly urging said gib against said hook-body.

13. A loop-taker for sewing machines comprising a loop-seizing member having a raceway substantially rectangular in cross-section in which the bearing rib of a thread-case is journaled, a portion of said raceway being formed by a gib yieldingly urged into engagement with the hookbody and having a wall and an overhanging ledge which together with the hook-body form the raceway.

14. A circularly movable loop-taker for sewing machines including an element by which the lower thread-mass is sustained, a supporting element therefor, yielding interlocking means between said elements to prevent separation of the same, said interlocking means being yieldable in a plane at right angles to the axis of said loop- 75 taker during the operation of the machine, and means for limiting the yielding movement of said interlocking means.

15. In lock-stitch forming mechanism for sewing machines, an element by which the lower thread-mass is sustained, a supporting element therefor, one of said elements having a circular bearing rib and the other of said elements being constructed with a raceway for said bearing rib having spaced parallel bearing walls and a third bearing wall between the planes of said parallel bearing walls, at least a portion of said third bearing wall being radially yieldable relative to at least one of said parallel walls.

16. A loop-taker for sewingmachines comprising a member having a loop-seizing beak, a thread-carrying member, and interlocking means between said members, said interlocking means including a gib pivoted to one of said members, and a spring constantly urging said gib about said pivot into engagement with the other of said members.

17. A loop-taker for sewing machines comprising a base, a ange on said base having one end terminating in a loop-seizing beak, a pivot-pin extending at right angles from said base, a gib pivoted on said pivot-pin, a spring yieldingly urging said gib about said pivot-pin, said ange and gib being formed with an annular raceway, and a thread-case having an annular bearing rib journalecl in said raceway.

18. A loop-taker for sewing machines comprising a base formed with a ange terminating at one end in a loop-seizing beak and at its opposite end in a wall having an overhanging portion, a gib pivoted to said base at a point beneath said overhanging portion, a spring reacting between said base and said gib for constantly urging said gib about its pivot, said flange and gib together forming an annular raceway, and a thread-case having an annular bearing ange journaled in said raceway.

19. A circularly movable loop-taker for sewing machines comprising a hook-body formed with a flange having a raceway and a loop-seizing beak, a gib p-ivoted tosaid hook-body, resilient means constantly urging said gib about its pivot in the plane of movement of the hook-body, said gib together with said hook-body forming a raceway which is in the same plane as the raceway in the flange, a thread-case having an annular bearing flange journaled in said raceway, and means for limiting the movement of said gib, whereby the bobbin-case and hook-body are prevented from separating when an abnormal obstruction is encountered in the raceway.

20. A circularly movable loop-taker for sewing machines comprising a hook-body formed with a flange and a loop-seizing beak, a gib formed with a Wall and an overhanging flange pivoted to said hook-body, said gib together with said hook-body forming a continuation of the raceway in said flange, a spring located in a recess in the hookbodyand having a free'end which engages said gib and urges it about its pivot in the plane of movement of the loop-taker, and a thread-case having an annular bearing flange journaled in said raceway.

21. In stitch-forming mechanism for sewing machines the combination with a reciprocating needle, of loop-taking mechanism, said loop-taking mechanism comprising stationary and movable members one of which is provided with a circular raceway and the other of which is provided with a bearing rib journaled in said raceway, thread-mass supporting means within the field of said raceway, said raceway being radially yieldable to abnormal obstruction during the operation of the machine, one of said members also being provided with a beak movable in a fixed and invariable circular path for seizing thread-loops from said needle for passage around a lower thread-mass disposed within the field of said beak.

22. In stitch-forming mechanism of the lockstitch type, a circularly moving loop-seizing member, a relativehT immovable member related thereto in the performance of a stitch-forming cycle, and a supporting connection between said members including a raceway in the one and a bearing member in the other entering said raceway, said raceway having a section which is adapted to yield away from the axis of motion of said loopseizing member during the operation of the machine, one of said members having provision for holding a mass of lower thread.

HERBERT J. GOOSMAN. 

